US10829644B2 - Pattern forming method as well as production methods for processed substrate, optical component, circuit board, electronic component and imprint mold - Google Patents
Pattern forming method as well as production methods for processed substrate, optical component, circuit board, electronic component and imprint mold Download PDFInfo
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- US10829644B2 US10829644B2 US15/453,557 US201715453557A US10829644B2 US 10829644 B2 US10829644 B2 US 10829644B2 US 201715453557 A US201715453557 A US 201715453557A US 10829644 B2 US10829644 B2 US 10829644B2
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- 238000001127 nanoimprint lithography Methods 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
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- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- YNXCGLKMOXLBOD-UHFFFAOYSA-N oxolan-2-ylmethyl prop-2-enoate Chemical compound C=CC(=O)OCC1CCCO1 YNXCGLKMOXLBOD-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
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- LXTZRIBXKVRLOA-UHFFFAOYSA-N padimate a Chemical compound CCCCCOC(=O)C1=CC=C(N(C)C)C=C1 LXTZRIBXKVRLOA-UHFFFAOYSA-N 0.000 description 1
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 1
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- 229910052814 silicon oxide Inorganic materials 0.000 description 1
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- 239000010409 thin film Substances 0.000 description 1
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Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/0002—Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/10—Esters
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/101—Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/16—Coating processes; Apparatus therefor
- G03F7/162—Coating on a rotating support, e.g. using a whirler or a spinner
Definitions
- the present invention relates to a pattern forming method, a method of producing a processed substrate, a method of producing an optical component, a method of producing a circuit board, a method of producing an electronic component, and a method of producing an imprint mold.
- a photocurable composition (resist) is cured in a state in which a mold having a fine groove/land pattern formed on its surface is pressed against a substrate (wafer) having applied thereto the photocurable composition.
- the groove/land pattern of the mold is transferred onto the cured film of the photocurable composition and hence the pattern is formed on the substrate.
- a fine structural body of the order of several nanometers can be formed on the substrate.
- FIGS. 1A through 1F A photo-nanoimprint technology disclosed in Japanese Patent No. 4791357 is described with reference to FIGS. 1A through 1F (including FIGS. 1DA and 1FA ).
- a liquid resist 102 is dispensed dropwise discretely onto a pattern formation region on a substrate 101 by using an inkjet method (arranging step (1), FIGS. 1A through 1C ).
- Droplets of the resist 102 dispensed dropwise spread on the substrate 101 as indicated by arrows 104 showing the direction in which droplets spread, and the phenomenon is called prespread ( FIG. 1C ).
- the resist 102 is molded with a mold 105 that has a pattern formed thereon and is transparent to irradiation light 106 to be described later (mold contacting step (2), FIGS. 1D and 1DA ).
- the mold contacting step the droplets of the resist 102 spread over the entire region of a gap between the substrate 101 and the mold 105 as indicated by the arrows 104 showing the direction in which droplets spread ( FIG. 1D ). The phenomenon is called spread.
- the resist 102 is filled into a groove portion on the mold 105 as indicated by the arrows 104 showing the direction in which droplets spread by the capillary phenomenon ( FIG. 1DA ). The filling phenomenon is called fill.
- a time period required for the spread and the fill to be completed is called a filling time.
- the resist 102 is cured by being irradiated with irradiation light 106 (light irradiating step (3), FIG. 1E ), and then the substrate 101 is released from the mold 105 (releasing step (4), FIGS. 1F and 1FA ).
- the performance of those steps results in the formation of a photocured film 107 having a predetermined pattern shape ( FIG. 1F ) on the substrate 101 .
- the photo-nanoimprint technology disclosed in Japanese Patent No. 4791357 has involved a problem in that a time period (filling time) from the initiation of the contact of the mold to the completion of the spread and the fill is long, and hence throughput is low.
- the inventors of the present invention have devised a photo-nanoimprint technology having a short filling time, in other words, high throughput (short spread time nanoimprint lithography, hereinafter referred to as “SST-NIL”).
- SST-NIL high throughput nanoimprint lithography
- a series of step units ranging from the second laying step (2) to the releasing step (5) is referred to as “shot”, and a region where the mold 205 is in contact with the curable compositions (A1) 202 and (A2) 203 , in other words, a region where a pattern is formed on the substrate 201 is referred to as “shot region”.
- the droplets of the curable composition (A2) 203 dispensed dropwise discretely expand quickly on the liquid film of the curable composition (A1) 202 as indicated by arrows 204 showing the direction in which droplets spread, and hence a filling time is short and throughput is high.
- arrows 204 showing the direction in which droplets spread, and hence a filling time is short and throughput is high.
- FIGS. 3A through 3D A problem with a conventional photo-nanoimprint technology (including the SST-NIL) is described with reference to the schematic sectional views of FIGS. 3A through 3D (including FIGS. 3CA and 3DA ).
- a curable composition (A2) 303 dispensed dropwise discretely onto a shot region 304 on a substrate 301 in the laying step (1) is sandwiched between a mold 305 and the substrate 301 in the mold contacting step (2), and is cured in the subsequent light irradiating step (3) as shown in FIGS. 3A through 3C .
- the mold 305 is released from a layer formed of the curable composition after the curing in the releasing step (4) of FIG. 3D .
- the inventors of the present invention have found the following problem: spread and fill in the mold contacting step (2) are slow, and hence a non-filling portion 306 occurs in the light irradiating step (3) to finally cause a non-filling defect 307 after the releasing step (4).
- the inventors have also found the following problem: when a filling time is lengthened so that the non-filling defect 307 may be prevented from occurring, productivity reduces as a result of the lengthening, and in particular, high throughput serving as one advantage of the SST-NIL is not exploited.
- An object of the present invention is to provide a pattern forming method having higher throughput as a result of further shortening of a filling time in the conventional photo-nanoimprint technology, especially the SST-NIL.
- the component (e1) is a compound having a surface tension higher than that of the polymerizable compound (a1),
- a surface tension of a composition of components of the curable composition (A1) except a solvent being higher than a surface tension of a composition of components of the curable composition (A2) except a solvent.
- the pattern forming method having a short filling time, in other words, high throughput.
- FIGS. 1A, 1B, 1C, 1D, 1DA, 1E, 1F and 1FA are schematic sectional views for illustrating a precedent for a photo-nanoimprint technology.
- FIGS. 2A, 2B, 2C, 2D, 2E, 2F and 2G are schematic sectional views for illustrating a SST-NIL technology.
- FIGS. 3A, 3B, 3C, 3CA, 3D and 3DA are schematic sectional views for illustrating a problem to be solved by the invention.
- a curable composition (A1) contains at least a component (a1) serving as a polymerizable compound and a component (e1) serving as a compound having a surface tension higher than that of the polymerizable compound (a1).
- a curable composition (A2) contains at least a component (a2) serving as a polymerizable compound.
- the surface tension of the curable composition (A1) is higher than the surface tension of the curable composition (A2).
- the curable composition (A1) may further contain a component (c1) serving as a non-polymerizable compound or a component (d1) serving as a solvent.
- the curable composition (A2) may further contain a component (b2) serving as a photopolymerization initiator, a component (c2) serving as a non-polymerizable compound, or a component (d2) serving as a solvent.
- component (a) refers to the “components (a1) and (a2).
- component (a1) means the component (a) to be included in the curable composition (A1)
- component (a2) means the component (a) to be included in the curable composition (A2).
- the component (a) is a polymerizable compound.
- the polymerizable compound as used herein is a compound that reacts with a polymerizing factor (such as a radical) generated from the component (b) serving as a photopolymerization initiator to form a film formed of a polymer compound by a chain reaction (polymerization reaction).
- a polymerizing factor such as a radical
- polymerizable compound there is given, for example, a radical polymerizable compound.
- the components (a1) and (a2) may be composed of the same compound or the different compounds.
- the polymerizable compound serving as the components (a1) and (a2) may be formed of only one kind of polymerizable compound or a plurality of kinds of polymerizable compounds.
- the radical polymerizable compound be a compound having one or more acryloyl groups or methacryloyl groups, that is, (meth)acrylic compound are preferred. Therefore, it is preferred that the curable compositions (A1) and (A2) according to this embodiment each contain the (meth)acrylic compound as the components (a1) and (a2), it is more preferred that a main component for the component (a) be the (meth)acrylic compound, and it is most preferred that the entirety of the components (a1) and (a2) be the (meth)acrylic compound.
- the phrase “a main component for the components (a1) and (a2) is the (meth)acrylic compound” described herein means that the (meth)acrylic compound accounts for 90 wt % or more of the components (a1) and (a2).
- the radical polymerizable compound includes a plurality of kinds of compounds each having one or more acryloyl groups or methacryloyl groups
- the compound preferably contains a monofunctional (meth)acrylic monomer and a polyfunctional (meth)acrylic monomer. This is because the combination of the monofunctional (meth)acrylic monomer and the polyfunctional (meth)acrylic monomer provides a cured film having a high mechanical strength.
- Monofunctional (meth)acrylic compounds having one acryloyl group or methacryloyl group are exemplified by, but not limited to, phenoxyethyl (meth)acrylate, phenoxy-2-methylethyl (meth)acrylate, phenoxyethoxyethyl (meth)acrylate, 3-phenoxy-2-hydroxypropyl (meth)acrylate, 2-phenylphenoxyethyl (meth)acrylate, 4-phenylphenoxyethyl (meth)acrylate, 3-(2-phenylphenyl)-2-hydroxypropyl (meth)acrylate, E0-modified p-cumylphenyl (meth)acrylate, 2-bromophenoxyethyl (meth)acrylate, 2,4-dibromophenoxyethyl (meth)acrylate, 2,4,6-tribromophenoxyethyl (meth)acrylate, EO-modified phenoxy (meth)acrylate, PO
- Examples of commercial products corresponding to the monofunctional (meth)acrylic compounds include, but not limited to: Aronix (TM) M101, M102, M110, M111, M113, M117, M5700, TO-1317, M120, M150, and M156 (all of which are manufactured by Toagosei Co., Ltd); MEDOL10, MIBDOL10, CHDOL10, MMDOL30, MEDOL30, MIBDOL30, CHDOL30, LA, IBXA, 2-MTA, HPA, and Viscoat #150, #155, #158, #190, #192, #193, #220, #2000, #2100, and #2150 (all of which are manufactured by Osaka Organic Chemical Industry Ltd.); Light Acrylate BO-A, EC-A, DMP-A, THF-A, HOP-A, HOA-MPE, HOA-MPL, PO-A, P-200A, NP-4EA, and NP-8EA, and Epoxy Ester M-600A (all
- polyfunctional (meth)acrylic compounds having two or more acryloyl groups or methacryloyl groups are exemplified by, but not limited to, trimethylolpropane di(meth)acrylate, trimethylolpropane tri(meth)acrylate, EO-modified trimethylolpropane tri(meth)acrylate, PO-modified trimethylolpropane tri(meth)acrylate, EO,PO-modified trimethylolpropane tri(meth)acrylate, dimethyloltricyclodecane di(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, ethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, 1,4-butanediol di(me)
- Examples of commercial products corresponding to the polyfunctional (meth)acrylic compounds include, but not limited to: Upimer (TM) UV SA1002 and SA2007 (both of which are manufactured by Mitsubishi Chemical Corporation); Viscoat #195, #230, #215, #260, #335 HP, #295, #300, #360, #700, GPT, and 3PA (all of which are manufactured by Osaka Organic Chemical Industry Ltd.); Light Acrylate 4EG-A, 9EG-A, NP-A, DCP-A, BP-4EA, BP-4PA, TMP-A, PE-3A, PE-4A, and DPE-6A (all of which are manufactured by Kyoeisha Chemical Co., Ltd.); KAYARAD (TM) PET-30, TMPTA, R-604, DPHA, DPCA-20, -30, -60, and -120, and HX-620, D-310, and D-330 (all of which are manufactured by Nippon Kayaku Co., Ltd.); Aronix (TM) M208, M210, M
- the term “(meth)acrylate” means an acrylate or a methacrylate having an alcohol residue equal to the acrylate.
- the term “(meth)acryloyl group” means an acryloyl group or a methacryloyl group having an alcohol residue equal to the acryloyl group.
- EO refers to ethylene oxide
- the term “EO-modified compound A” means a compound in which a (meth)acrylic acid residue and an alcohol residue of the compound A are bonded to each other through a block structure of an ethylene oxide group.
- PO refers to propylene oxide
- PO-modified compound B means a compound in which a (meth)acrylic acid residue and an alcohol residue of the compound B are bonded to each other through a block structure of a propylene oxide group.
- the blending ratio of the component (a1) serving as a polymerizable compound in the curable composition (A1) is desirably 50 wt % or more and 100 wt % or less with respect to the total weight of the component (a1), the component (b1), the component (c1), and the component (e1), i.e., the total weight of the components of the curable composition (A1) except the component (d1) serving as a solvent.
- the blending ratio is preferably 80 wt % or more and 100 wt % or less, more preferably more than 90 wt % or more and 100 wt % or less.
- a cured film to be obtained can be turned into a cured film having some degree of mechanical strength.
- the blending ratio of the component (a2) serving as a polymerizable compound in the curable composition (A2) is desirably 50 wt % or more and 99.9 wt % or less with respect to the total weight of the component (a2), the component (b2), and the component (c2), i.e., the total weight of the components of the curable composition (A2) except the component (d2) serving as a solvent.
- the blending ratio is preferably 80 wt % or more and 99 wt % or less, more preferably more than 90 wt % and 98 wt % or less.
- a cured film to be obtained can be turned into a cured film having some degree of mechanical strength.
- the curable composition (A1) contain the component (d1).
- the blending ratio of the component (a1) in the curable composition (A1) is desirably 0.01 wt % or more and 10 wt % or less with respect to the total weight of the components of the curable composition (A1) containing the component (d1) serving as a solvent.
- the component (b) is a photopolymerization initiator.
- the photopolymerization initiator as used herein is a compound that detects light having a predetermined wavelength to generate the above-mentioned polymerizing factor (radical).
- the photopolymerization initiator is a polymerization initiator (radical generator) that generates a radical with light (a radiation, e.g., an infrared ray, a visible ray, an ultraviolet ray, a far ultraviolet ray, an X-ray, or a charged particle ray, such as an electron beam).
- a radiation e.g., an infrared ray, a visible ray, an ultraviolet ray, a far ultraviolet ray, an X-ray, or a charged particle ray, such as an electron beam.
- the component (b) may be formed of one kind of photopolymerization initiator or a plurality of kinds of photopolymerization initiators.
- radical generator examples include, but not limited to: 2,4,5-triarylimidazole dimers that may have a substituent, such as a 2-(o-chlorophenyl)-4,5-diphenylimidazole dimer, a 2-(o-chlorophenyl)-4,5-di(methoxyphenyl)imidazole dimer, a 2-(o-fluorophenyl)-4,5-diphenylimidazole dimer, and a 2-(o- or p-methoxyphenyl)-4,5-diphenylimidazole dimer; benzophenone and benzophenone derivatives, such as N,N′-tetramethyl-4,4′-diaminobenzophenone (Michler's ketone), N,N′-tetraethyl-4,4′-diaminobenzophenone, 4-methoxy-4′-dimethylaminobenzophenone, 4-chlorobenzophenone, 4,
- Examples of commercial products corresponding to the radical generator include, but not limited to, Irgacure 184, 369, 651, 500, 819, 907, 784, and 2959, CGI-1700, -1750, and ⁇ 1850, CG24-61, Darocur 1116 and 1173, Lucirin (TM) TPO, LR8893, and LR8970 (all of which are manufactured by BASF), and Ubecryl P36 (manufactured by UCB).
- the component (b) is preferably an acylphosphine oxide-based polymerization initiator.
- the acylphosphine oxide-based polymerization initiator is, of the examples described above, an acylphosphine oxide compound, such as 2,4,6-trimethylbenzoyl diphenyl phosphine oxide, bis(2,4,6-trimethylbenzoyl) phenyl phosphine oxide, or bis(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentyl phosphine oxide.
- the curable composition (A1) is substantially free of photoreactivity.
- the blending ratio of the component (b1) serving as a photopolymerization initiator in the curable composition (A1) is preferably less than 0.1 wt % with respect to the total weight of the component (a1), the component (b1), the component (c1), and the component (e1) to be described later, i.e., the total weight of the components of the curable composition (A1) except the component (d1) serving as a solvent.
- the blending ratio is more preferably 0.01 wt % or less, and further preferably 0.001 wt % or less.
- the blending ratio of the component (b2) serving as a photopolymerization initiator in the curable composition (A2) is desirably 0.1 wt % or more and 50 wt % or less with respect to the total weight of the component (a2), the component (b2), and the component (c2) to be described later, i.e., the total weight of the components of the curable composition (A2) except the component (d2) serving as a solvent.
- the blending ratio is preferably 0.1 wt % or more and 20 wt % or less, more preferably 1 wt % or more and 10 wt % or less.
- the blending ratio of the component (b2) in the curable composition (A2) is set to 0.1 wt % or more with respect to the total weight of the component (a2), the component (b2), and the component (c2), the curing rate of the composition increases and hence reaction efficiency can be improved.
- the blending ratio of the component (b2) is set to 50 wt % or less with respect to the total weight of the component (a2), the component (b2), and the component (c2), a cured film to be obtained can be turned into a cured film having some degree of mechanical strength.
- the curable compositions (A1) and (A2) according to this embodiment can each further contain the component (c) serving as a non-polymerizable compound in addition to the component (a) and the component (b) described in the foregoing in accordance with various purposes to the extent that the effects of the present invention are not impaired.
- component (c) is, for example, a compound that is free of a polymerizable functional group, such as a (meth)acryloyl group, and is free of an ability to sense light having a predetermined wavelength to generate the polymerizing factor (radical). Examples thereof include a sensitizer, a hydrogen donor, an internal addition-type release agent, a surfactant, an antioxidant, a polymer component, and other additives. Two or more kinds of the compounds may be incorporated as the component (c).
- the sensitizer is a compound to be appropriately added for the purpose of accelerating a polymerization reaction or enhancing a reaction conversion ratio.
- the sensitizer there is given, for example, a sensitizing dye.
- the sensitizing dye is a compound that is excited by absorbing light having a specific wavelength to interact with the component (b) serving as a polymerization initiator.
- interaction refers to, for example, the transfer of energy or an electron from the sensitizing dye in an excited state to the component (b) serving as a polymerization initiator.
- the sensitizing dye include, but not limited to, an anthracene derivative, an anthraquinone derivative, a pyrene derivative, a perylene derivative, a carbazole derivative, a benzophenone derivative, a thioxanthone derivative, a xanthone derivative, a coumarin derivative, a phenothiazine derivative, a camphorquinone derivative, an acridine-based dye, a thiopyrylium salt-based dye, a merocyanine-based dye, a quinoline-based dye, a styrylquinoline-based dye, a ketocoumarin-based dye, a thioxanthene-based dye, a xanthene-based dye, an oxonol-based dye, a cyanine-based dye, a rhodamine-based dye, and a pyrylium salt-based dye.
- One kind of the sensitizers may be used alone, or two or more kinds thereof may be used as a mixture.
- the hydrogen donor is a compound capable of reacting with an initiation radical generated from the component (b) serving as a polymerization initiator or the radical of a polymerization growth terminal to generate a more reactive radical.
- the hydrogen donor is preferably added when the component (b) serving as a polymerization initiator is a photoradical generator.
- hydrogen donor examples include, but not limited to, amine compounds, such as n-butylamine, di-n-butylamine, allylthiourea, triethylamine, diethylaminoethyl methacrylate, triethylenetetramine, a 4,4′-bis(dialkylamino)benzophenone, N,N-dimethylaminobenzoic acid ethyl ester, N,N-dimethylaminobenzoic acid isoamyl ester, pentyl-4-dimethylaminobenzoate, triethanolamine, and N-phenylglycine, mercapto compounds, such as 2-mercapto-N-phenylbenzimidazole and a mercaptopropionic acid ester, sulfur compounds, such as s-benzylisothiuronium-p-toluenesulfinate, and phosphorous compounds, such as tri-n-butylphosphine.
- One kind of the hydrogen donors may be used alone, or two or more kinds thereof may be used as a mixture.
- the hydrogen donor may have a function as a sensitizer.
- the internal addition-type release agent can be added to each of the curable compositions for the purpose of reducing an interfacial bonding force between a mold and a resist, i.e., reducing a release force in a releasing step to be described later.
- the term “internal addition-type” as used herein means that the release agent is added to the curable composition prior to the step of arranging the curable composition.
- surfactants such as a silicone-based surfactant, a fluorine-based surfactant, and a hydrocarbon-based surfactant, can each be used as the internal addition-type release agent.
- the internal addition-type release agent is free of polymerizability.
- fluorine-based surfactant examples include a polyalkylene oxide (such as polyethylene oxide or polypropylene oxide) adduct of an alcohol having a perfluoroalkyl group, and a polyalkylene oxide (such as polyethylene oxide or polypropylene oxide) adduct of perfluoropolyether.
- the fluorine-based surfactant may have, for example, a hydroxyl group, an alkoxy group, an alkyl group, an amino group, or a thiol group on part (for example, as a terminal group) of its molecular structure.
- a commercial product may be used as the fluorine-based surfactant.
- the commercial product include MEGAFACE (TM) F-444, TF-2066, TF-2067, and TF-2068 (all of which are manufactured by DIC Corporation), Fluorad FC-430 and FC-431 (both of which are manufactured by Sumitomo 3M Limited), Surflon (TM) S-382 (manufactured by AGC), EFTOP EF-122A, 122B, and 122C, EF-121, EF-126, EF-127, and MF-100 (all of which are manufactured by Tohkem Products Corp.), PF-636, PF-6320, PF-656, and PF-6520 (all of which are manufactured by OMNOVA Solutions), UNIDYNE (TM) DS-401, DS-403, and DS-451 (all of which are manufactured by Daikin Industries, Ltd.), and Ftergent (TM) 250, 251, 222F, and 208G (all of which are manufactured by Neo
- the internal addition-type release agent may be the hydrocarbon-based surfactant.
- the hydrocarbon-based surfactant includes, for example, an alkyl alcohol polyalkylene oxide adduct, in which an alkylene oxide having 2 to 4 carbon atoms is added to an alkyl alcohol having 1 to 50 carbon atoms.
- alkyl alcohol polyalkylene oxide adduct examples include a methyl alcohol ethylene oxide adduct, a decyl alcohol ethylene oxide adduct, a lauryl alcohol ethylene oxide adduct, a cetyl alcohol ethylene oxide adduct, a stearyl alcohol ethylene oxide adduct, and a stearyl alcohol ethylene oxide/propylene oxide adduct.
- the terminal group of the alkyl alcohol polyalkylene oxide adduct is not limited to a hydroxyl group, which is simply produced by adding a polyalkylene oxide to an alkyl alcohol.
- the hydroxyl group may be substituted with another substituent, for example, a polar functional group, such as a carboxyl group, an amino group, a pyridyl group, a thiol group, or a silanol group, or a hydrophobic functional group, such as an alkyl group or an alkoxy group.
- a polar functional group such as a carboxyl group, an amino group, a pyridyl group, a thiol group, or a silanol group
- a hydrophobic functional group such as an alkyl group or an alkoxy group.
- alkyl alcohol polyalkylene oxide adduct a commercial product may be used.
- the commercial product include polyoxyethylene methyl ether (methyl alcohol ethylene oxide adduct) (BLAUNON MP-400, MP-550, and MP-1000) manufactured by Aoki Oil Industrial Co., Ltd., polyoxyethylene decyl ether (decyl alcohol ethylene oxide adduct) (FINESURF D-1303, D-1305, D-1307, and D-1310) manufactured by Aoki Oil Industrial Co., Ltd., polyoxyethylene lauryl ether (lauryl alcohol ethylene oxide adduct) (BLAUNON EL-1505) manufactured by Aoki Oil Industrial Co., Ltd., polyoxyethylene cetyl ether (cetyl alcohol ethylene oxide adduct) (BLAUNON CH-305 and CH-310) manufactured by Aoki Oil Industrial Co., Ltd., polyoxyethylene stearyl ether (stearyl alcohol ethylene oxide adduct) (BLAUNON SR
- alkyl alcohol polyalkylene oxide adduct is preferred as the internal addition-type release agent, and a long-chain alkyl alcohol polyalkylene oxide adduct is more preferred.
- One kind of the internal addition-type release agents may be used alone, or two or more kinds thereof may be used as a mixture.
- the blending ratio of the component (c) serving as a non-polymerizable compound in each of the curable compositions is desirably 0 wt % or more and 50 wt % or less with respect to the total weight of the component (a), the component (b), and the component (c) to be described later, i.e., the total weight of the components of the curable compositions except the solvent.
- the blending ratio is preferably 0.1 wt % or more and 50 wt % or less, more preferably 0.1 wt % or more and 20 wt % or less.
- a cured film to be obtained can be turned into a cured film having some degree of mechanical strength.
- the curable compositions according to this embodiment may each contain the component (d) serving as a solvent.
- the component (d) is not particularly limited as long as the component is a solvent that dissolves the component (a), the component (b), and the component (c).
- the solvent is preferably a solvent having a boiling point at normal pressure of 80° C. or more and 200° C. or less.
- the solvent is more preferably a solvent having at least one of an ester structure, a ketone structure, a hydroxyl group, or an ether structure.
- the solvent is specifically, for example, a single solvent selected from propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether, cyclohexanone, 2-heptanone, ⁇ -butyrolactone, and ethyl lactate, or a mixed solvent of two or more kinds thereof.
- the curable composition (A1) according to this embodiment preferably contains the component (d1). This is because, as described later, a spin coating method is preferred as a method of applying the curable composition (A1) onto the substrate.
- the component (e1) is a compound that is liquid at room temperature, the compound having a surface tension higher than that of the component (a1) serving as a polymerizable compound.
- the component (e1) is a compound that is solid at room temperature, the compound having the following characteristics: a mixture of the compound and the component (a1) serving as a polymerizable compound is liquid at room temperature, and the mixture has a surface tension higher than that of the component (a1).
- Such compound is limited to a compound that has a surface tension higher than that of the component (a1) serving as a polymerizable compound, that dissolves in the component (a1) and the component (a2), and the component (d1), and that is free of a photopolymerization initiating ability.
- a preferred compound having a high surface tension is a compound that can be bonded to the component (a1) and the component (a2) through a radical reaction.
- a hydrogen donor that promotes radical polymerization is more preferred.
- Specific preferred examples thereof include a thiol compound and an amine compound.
- the component (e1) may include only one kind of compound, or may include a plurality of kinds of compounds.
- Specific examples of the component (e1) are not particularly limited as long as the examples are each a compound satisfying the foregoing, but the inventors of the present invention have found the following compounds as preferred examples.
- the specific examples include pentaerythritol tetrakis(3-mercaptobutyrate), 1,10-decanedithiol, pentaerythritol tetrakis(3-mercaptopropionate), 1,3,5-tris(3-mercaptobutyryloxyethyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, trimethylolpropane tris(3-mercaptopropionate), and 1,4-bis(3-mercaptobutyryloxy) butane.
- Particularly preferred examples thereof include pentaerythritol tetrakis(3-mercaptobutyrate), 1,10-decanedithiol, pentaerythritol tetrakis(3-mercaptopropionate), and 1,3,5-tris(3-mercaptobutyryloxyethyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione.
- each component is mixed and dissolved under a predetermined temperature condition. Specifically, the preparation is performed in a range of from 0° C. or more to 100° C. or less.
- the curable compositions (A1) and (A2) according to this embodiment are preferably liquid. This is because in a mold contacting step to be described later, the spread and fill of the curable composition (A1) and/or the curable composition (A2) are quickly completed, in other words, a filling time is short.
- the viscosity of a composition of the components of the curable composition (A1) except the component (d1) serving as a solvent according to this embodiment at 25° C. is preferably 1 mPa ⁇ s or more and 1,000 mPa ⁇ s or less.
- the viscosity is more preferably 1 mPa ⁇ s or more and 500 mPa ⁇ s or less, still more preferably 1 mPa ⁇ s or more and 100 mPa ⁇ s or less.
- the viscosity of a composition of the components of the curable composition (A2) except the component (d2) serving as a solvent according to this embodiment at 25° C. is preferably 1 mPa ⁇ s or more and 100 mPa ⁇ s or less. In addition, the viscosity is more preferably 1 mPa ⁇ s or more and 50 mPa ⁇ s or less.
- the viscosities of the curable compositions (A1) and (A2) are set to 100 mPa ⁇ s or less, spread and fill are quickly completed at the time of the bringing of the curable compositions (A1) and (A2) into contact with the mold (S. Reddy, R. T. Bonnecaze/Microelectronic Engineering, (2005) 60-70).
- a photo-nanoimprint method can be performed at high throughput.
- a pattern defect due to a filling failure hardly occurs.
- the viscosities are set to 1 mPa ⁇ s or more, application unevenness hardly occurs at the time of the application of the curable compositions (A1) and (A2) onto the substrate. Further, when the curable compositions (A1) and (A2) are brought into contact with the mold, the curable compositions (A1) and (A2) hardly flow out of an end portion of the mold.
- the surface tension of the compositions of the components of the curable compositions (A1) and (A2) except the component (d) serving as a solvent at 23° C. is preferably 5 mN/m or more and 70 mN/m or less.
- the surface tension is more preferably 7 mN/m or more and 50 mN/m or less, still more preferably 10 mN/m or more and 40 mN/m or less.
- the curable composition (A1) of the present invention contains the component (e1), and hence has a surface tension even higher than that of the conventional curable composition (A1) for the SST-NIL.
- a cured film obtained by curing the curable compositions becomes a cured film having surface smoothness.
- the surface tension of a composition of the components of the curable composition (A1) except the component (d1) serving as a solvent is preferably higher than the surface tension of a composition of the components of the curable composition (A2) except the component (d2) serving as a solvent.
- the Marangoni effect is a free surface movement phenomenon resulting from a local difference in surface tension between liquids (N. Imaishi/Int. J. Microgravity Sci. No. 31 Supplement 2014 (S5-S12)).
- the difference in surface tension in other words, surface energy serves as a driving force to cause such diffusion that a liquid having a low surface tension covers a wider surface.
- the curable composition (A1) having a high surface tension is applied to the entire surface of the substrate and the curable composition (A2) having a low surface tension is dispensed dropwise, the prespread of the curable composition (A2) is accelerated.
- the contact angle of the compositions of the components of the curable compositions (A1) and (A2) except the component (d) serving as a solvent is preferably 0° or more and 90° or less with respect to each of both the surface of the substrate and the surface of the mold.
- a capillary force acts in a negative direction (direction in which a contact interface between the mold and the curable composition is shrunk) in a mold pattern or in a gap between the substrate and the mold, and hence the composition is not filled.
- the contact angle is particularly preferably 0° or more and 30° or less. As the contact angle becomes lower, a stronger capillary force acts and hence a filling rate increases (S. Reddy, R. T. Bonnecaze/Microelectronic Engineering, 82 (2005) 60-70).
- the viscosity, the surface tension, and the contact angle of each of the curable compositions (A1) and (A2) according to this embodiment can be changed by addition of the component (d) serving as a solvent.
- the component (d) serving as a solvent may prevent curing of the curable compositions (A1) and (A2). Accordingly, the viscosity, the surface tension, and the contact angle of the compositions of the components of the curable compositions (A1) and (A2) except the component (d) serving as a solvent are used in this embodiment.
- curable compositions (A1) and (A2) according to this embodiment each be free of impurities to the extent possible.
- impurities refers to components except the component (a), the component (b), the component (c), the component (d) and the component (e1) described above.
- the curable compositions according to this embodiment each be obtained through a purification step.
- the purification step is preferably filtration using a filter or the like.
- the component (a) and the component (b) described in the foregoing and additive components to be added as required be mixed, and then the mixture be filtered with a filter having a pore diameter of, for example, 0.001 ⁇ m or more and 5.0 ⁇ m or less. It is more preferred that the filtration using a filter be performed in a plurality of stages or be repeated a plurality of times. In addition, the filtered liquid may be filtered again. A plurality of filters having different pore diameters may be used to perform the filtration.
- a filter made of, for example, a polyethylene resin, a polypropylene resin, a fluororesin, or a nylon resin can be used as the filter to be used in the filtration. However, the filter is not particularly limited thereto.
- Impurities such as particles, which are mixed in the curable compositions, can be removed through such purification step.
- the impurities, such as the particles can be prevented from forming unexpected unevenness in the cured film to be obtained after the curable compositions are cured to cause a pattern defect.
- the curable compositions according to this embodiment are used for the manufacture of a semiconductor integrated circuit, it is preferred to avoid the mixing of metal atom-containing impurities (metal impurities) in the curable compositions to the extent possible in order to prevent the operation of a product from being inhibited.
- the concentration of the metal impurities in the curable compositions is preferably 10 ppm or less, more preferably 100 ppb or less.
- the pattern forming method according to this embodiment is one mode of the photo-nanoimprint method.
- the pattern forming method of this embodiment includes:
- a cured product obtained by the method of producing a cured product having a pattern shape according to this embodiment is preferably a film having a pattern having a size of 1 nm or more and 10 mm or less.
- the cured film is more preferably a film having a pattern having a size of 10 nm or more and 100 ⁇ m or less.
- a pattern forming technology for producing a film having a pattern (uneven structure) of a nanosize (1 nm or more and 100 nm or less) through the use of light is called a photo-nanoimprint method.
- the pattern forming method according to this embodiment uses the photo-nanoimprint method.
- the curable composition (A1) 202 according to this embodiment described in the foregoing is laid (applied) onto the substrate 201 to form an applied film.
- the substrate 201 on which the curable composition (A1) 202 is to be arranged is a substrate to be processed, and a silicon wafer is typically used.
- a layer to be processed may be formed on the substrate 201 .
- Another layer may be further formed between the substrate 201 and the layer to be processed.
- a quartz substrate is used as the substrate 201 , a replica of a quartz imprint mold (mold replica) can be produced.
- the substrate 201 is not limited to the silicon wafer and the quartz substrate.
- the substrate 201 can be arbitrarily selected from substrates known as substrates for semiconductor devices, such as aluminum, a titanium-tungsten alloy, an aluminum-silicon alloy, an aluminum-copper-silicon alloy, silicon oxide, and silicon nitride.
- the adhesiveness of the surface of the substrate 201 (substrate to be processed) to be used or of the layer to be processed with each of the curable compositions (A1) 202 and (A2) 203 may be improved by a surface treatment, such as a silane coupling treatment, a silazane treatment, or the formation of an organic thin film.
- a surface treatment such as a silane coupling treatment, a silazane treatment, or the formation of an organic thin film.
- a method of arranging the curable composition (A1) 202 on the substrate 201 or the layer to be processed there may be used, for example, an ink jet method, a dip coating method, an air knife coating method, a curtain coating method, a wire bar coating method, a gravure coating method, an extrusion coating method, a spin coating method, or a slit scan method.
- a spin coating method is particularly preferred.
- the component (d1) serving as a solvent may be volatilized by performing a baking step as required.
- the average thickness of the film of the curable composition (A1) 202 which varies depending on applications where the composition is used, is, for example, 0.1 nm or more and 10,000 nm or less, preferably 1 nm or more and 20 nm or less, particularly preferably 1 nm or more and 10 nm or less.
- droplets of the curable composition (A2) 203 are preferably dispensed dropwise discretely and arranged on the layer of the curable composition (A1) 202.
- the inkjet method is particularly preferred as a method for the arrangement.
- the droplets of the curable composition (A2) 203 are densely arranged on a substrate 201 facing a region where groove portions are densely present on the mold 205 , and are sparsely arranged on a substrate 201 facing a region where groove portions are sparsely present.
- the thickness of a remaining film to be described later can be controlled to a uniform value irrespective of the density of a pattern on the mold 205 .
- the droplets of the curable composition (A2) 203 arranged in this step are quickly spread by the Marangoni effect as described in the foregoing (prespread).
- the mold 205 having a template pattern for transferring a pattern shape is brought into contact with a layer of a liquid obtained by partially mixing the curable composition (A1) 202 and the curable composition (A2) 203 , the liquid being formed in the previous steps (first and second laying steps).
- a groove portion of a fine pattern on the surface of the mold 205 is filled with the liquid obtained by partially mixing the curable composition (A1) 202 and the curable composition (A2) 203 , and hence a liquid film filled into the fine pattern of the mold 205 is obtained.
- the mold 205 that is formed of an optically transparent material is desirably used as the mold 205 considering the next step (light irradiating step).
- Preferred specific examples of the material for forming the mold 205 include: glass, quartz, an optically transparent resin, such as PMMA or a polycarbonate resin, a transparent metal-deposited film, a flexible film made of polydimethylsiloxane or the like, a photocured film, and a metal film.
- the optically transparent resin as the material for forming the mold 205 , it is necessary to select a resin that does not dissolve in a component contained in the curable composition (A1) 202 or (A2) 203 . Quartz is particularly preferred as the material for forming the mold 205 because of its small thermal expansion coefficient and small pattern deformation.
- the fine pattern on the surface of the mold 205 preferably has a pattern height of 4 nm or more and 200 nm or less.
- the force by which the mold 205 is peeled from the cured film 207 of a resist in the releasing step i.e., a release force reduces, and the number of release defects remaining on a mask side owing to the tearing-off of a resist pattern in association with the release reduces.
- Adjacent resist patterns are brought into contact with each other by the elastic deformation of the resist patterns due to an impact at the time of the peeling of the mold, and hence the resist patterns adhere to each other or are damaged in some cases.
- the pattern height is about twice or less as large as a pattern width (an aspect ratio is 2 or less)
- the pattern height is excessively low, the processing accuracy of the substrate 201 (substrate to be processed) is low.
- the mold 205 may be subjected to a surface treatment before this step, which is a mold contacting step of the curable compositions (A1) 202 and (A2) 203 and the mold 205 , so as to enhance the releasability between the curable compositions (A1) 202 and (A2) 203 and the surface of the mold 205 .
- a surface treatment there is given a method involving forming a release agent layer by applying a release agent onto the surface of the mold 205 .
- examples of the release agent to be applied onto the surface of the mold 205 include a silicon-based release agent, a fluorine-based release agent, a hydrocarbon-based release agent, a polyethylene-based release agent, a polypropylene-based release agent, a paraffin-based release agent, a montan-based release agent, and a carnauba-based release agent.
- a commercially available application-type release agent such as OPTOOL (TM) DSX manufactured by Daikin Industries, Ltd. can be suitably used.
- One kind of the release agents may be used alone, or two or more kinds thereof may be used in combination. Of those, fluorine-based and hydrocarbon-based release agents are particularly preferred.
- a pressure to be applied to the curable compositions (A1) 202 and (A2) 203 when the mold 205 and the curable compositions (A1) 202 and (A2) 203 are brought into contact with each other in this step (mold contacting step) as illustrated in FIG. 2E is not particularly limited.
- the pressure is desirably set to 0 MPa or more and 100 MPa or less.
- the pressure is preferably 0 MPa or more and 50 MPa or less, more preferably 0 MPa or more and 30 MPa or less, still more preferably 0 MPa or more and 20 MPa or less.
- the prespread of the droplets of the curable composition (A2) 203 has progressed in the previous step (second laying step), and hence the spread of the curable composition (A2) 203 in this step is quickly completed.
- the spread is finally completed and the concentration of the curable composition (A1) 202 is high.
- the contact angle of the curable composition (A1) 202 is low and hence the fill is quickly completed in the region as well.
- the spread and fill of the curable compositions (A1) 202 and (A2) 203 are quickly completed in this step, and hence the time period for which the mold 205 , and the curable compositions (A1) 202 and (A2) 203 are brought into contact with each other can be set to be short.
- one of the effects of the present invention is as follows: many pattern forming steps can be completed within a short time period, and hence high productivity is obtained.
- the time period for which the mold and the compositions are brought into contact with each other which is not particularly limited, is desirably set to, for example, 0.1 second or more and 600 seconds or less.
- the time period is preferably 0.1 second or more and 3 seconds or less, particularly preferably 0.1 second or more and 1 second or less.
- the time period is shorter than 0.1 second, the following tendency is observed: the spread and the fill become insufficient, and hence many defects called non-filling defects occur.
- This step can be performed under any condition of an air atmosphere, a reduced pressure atmosphere, and an inert gas atmosphere. Of those atmospheres, a reduced pressure atmosphere or an inert gas atmosphere is preferred because an influence of oxygen or moisture on a curing reaction can be prevented.
- an inert gas atmosphere specific examples of the inert gas that can be used include nitrogen, carbon dioxide, helium, argon, various fluorocarbon gases, and a mixed gas thereof.
- a preferred pressure when this step is performed under a particular gas atmosphere including an air atmosphere is 0.0001 atm or more and 10 atm or less.
- the mold contacting step may be performed under an atmosphere containing a condensable gas (hereinafter referred to as “condensable gas atmosphere”).
- condensable gas atmosphere refers to the following gas: when the gas in the atmosphere is filled into a groove portion of the fine pattern formed on the mold 205 , and the gap between the mold 205 and the substrate 201 together with the curable compositions (A1) 202 and (A2) 203 , the gas is condensed by a capillary pressure generated at the time of the filling to liquefy.
- the condensable gas is present as a gas in the atmosphere before the curable compositions (A1) 202 and (A2) 203 , and the mold 205 are brought into contact with each other in the mold contacting step (see FIGS. 1D and 1DA ).
- the gas filled into a groove portion of the fine pattern is liquefied by a capillary pressure generated by the curable compositions (A1) 202 and (A2) 203 , and hence air bubbles disappear. Accordingly, a filling property becomes excellent.
- the condensable gas may dissolve in the curable composition (A1) 202 and/or the curable composition (A2) 203 .
- the boiling point of the condensable gas which is not limited as long as the boiling point is equal to or less than the ambient temperature of the mold contacting step, is preferably from ⁇ 10° C. to 23° C., more preferably from 10° C. to 23° C. When the boiling point falls within the range, the filling property is more excellent.
- the vapor pressure of the condensable gas at the ambient temperature in the mold contacting step which is not limited as long as the vapor pressure is equal to or less than a to be applied to the curable compositions (A1) 202 and (A2) 203 when the mold 205 and the curable compositions (A1) 202 and (A2) 203 are brought into contact with each other when impression is performed in the mold contacting step, is preferably from 0.1 MPa to 0.4 MPa.
- the vapor pressure falls within the range, the filling property is more excellent.
- the vapor pressure at the ambient temperature is more than 0.4 MPa, the following tendency is observed: an air bubble disappearing effect cannot be sufficiently obtained.
- the vapor pressure at the ambient temperature is less than 0.1 MPa, the following tendency is observed: decompression is needed and hence an apparatus becomes complicated.
- the ambient temperature in the mold contacting step which is not particularly limited, is preferably from 20° C. to 25° C.
- the condensable gas include fluorocarbons, such as: a chlorofluorocarbon (CFC), such as trichlorofluoromethane; a fluorocarbon (FC); a hydrochlorofluorocarbon (HCFC); a hydrofluorocarbon (HFC), such as 1,1,1,3,3-pentafluoropropane (CHF 2 CH 2 CF 3 , HFC-245fa, PFP); and a hydrofluoroether (HFE), such as pentafluoroethyl methyl ether (CF 3 CF 2 OCH 3 , HFE-245mc).
- CFC chlorofluorocarbon
- FC fluorocarbon
- HCFC hydrochlorofluorocarbon
- HFC hydrofluorocarbon
- HFC 1,1,1,3,3-pentafluoropropane
- HFE hydrofluoroether
- 1,1,1,3,3-pentafluoropropane (vapor pressure at 23° C.: 0.14 MPa, boiling point: 15° C.), trichlorofluoromethane (vapor pressure at 23° C.: 0.1056 MPa, boiling point: 24° C.), and pentafluoroethyl methyl ether are preferred from such a viewpoint that when the ambient temperature in the mold contacting step is from 20° C. to 25° C., the filling property is excellent. Further, 1,1,1,3,3-pentafluoropropane is particularly preferred from the viewpoint of being excellent in safety.
- condensable gases may be used alone, or two or more kinds thereof may be used as a mixture.
- any such condensable gas may be mixed with a non-condensable gas, such as air, nitrogen, carbon dioxide, helium, or argon, before use.
- the non-condensable gas with which the condensable gas is mixed is preferably helium from the viewpoint of the filling property. Helium can permeate the mold 205 .
- the condensable gas and helium in the atmosphere are filled into a groove portion of the fine pattern formed on the mold 205 in the mold contacting step together with the curable composition (A1) 202 and/or the curable composition (A2) 203 , the condensable gas liquefies and helium permeates the mold 205 .
- a mixture layer obtained by partially mixing the curable composition (A1) 202 and the curable composition (A2) 203 is irradiated with irradiation light 206 through the mold 205 .
- the curable composition (A1) 202 and/or the curable composition (A2) 203 filled into the fine pattern of the mold 205 are/is irradiated with the irradiation light 206 through the mold 205 .
- the curable composition (A1) 202 and/or the curable composition (A2) 203 filled into the fine pattern of the mold 205 are/is cured by the irradiation light 206 to become the cured film 207 having a pattern shape.
- the irradiation light 206 with which the curable composition (A1) 202 and/or the curable composition (A2) 203 filled into the fine pattern of the mold 205 are/is irradiated is selected depending on the sensitive wavelengths of the curable compositions (A1) 202 and (A2) 203 . Specifically, it is preferred that UV light having a wavelength of 150 nm or more and 400 nm or less, an X-ray, an electron beam, or the like be appropriately selected and used.
- the irradiation light 206 is particularly preferably UV light.
- the light source of UV light include a high-pressure mercury lamp, an ultra-high pressure mercury lamp, a low-pressure mercury lamp, a Deep-UV lamp, a carbon arc lamp, a chemical lamp, a metal halide lamp, a xenon lamp, a KrF excimer laser, an ArF excimer laser, and a F 2 excimer laser.
- an ultra-high pressure mercury lamp is particularly preferred.
- the number of the light sources to be used may be one or two or more.
- the entire surface of the curable composition (A1) 202 and/or the curable composition (A2) 203 filled into the fine pattern of the mold 205 may be irradiated with light, or a part of the surface thereof may be irradiated with light.
- the light irradiation may be performed on an entire region on the substrate 201 intermittently a plurality of times, or may be continuously performed on the entire region. Further, the following may be performed: a partial region A is irradiated with the light in a first irradiating process, and a region B different from the region A is irradiated with the light in a second irradiating process.
- the cured film 207 having a pattern shape and the mold 205 are released from each other.
- this step (releasing step) as illustrated in FIG. 2G , the cured film 207 having a pattern shape and the mold 205 are released from each other, and hence the cured film 207 having a pattern shape serving as the reverse pattern of the fine pattern formed on the mold 205 , the film being formed in the step (4) (light irradiating step), is obtained in an independent state.
- a cured film remains in a groove portion of the grove/land pattern of the cured film 207 having a pattern shape, and the film is called a remaining film 108 (see FIG. 1FA ).
- the condensable gas vaporizes in association with a reduction in pressure of the interface at which the cured film 207 and the mold 205 are in contact with each other at the time of the release of the cured film 207 and the mold 205 in the releasing step.
- a reducing effect on the release force serving as a force needed for releasing the cured film 207 and the mold 205 from each other tends to be exhibited.
- a method of releasing the cured film 207 having a pattern shape and the mold 205 from each other is not particularly limited as long as part of the cured film 207 having a pattern shape is not physically damaged at the time of the release, and various conditions and the like are also not particularly limited.
- the substrate 201 substrate to be processed
- the mold 205 is peeled by being moved so as to recede from the substrate 201 .
- the mold 205 is fixed and the substrate 201 is peeled by being moved so as to recede from the mold 205 .
- both the substrate 201 and the mold 205 may be peeled from each other by being pulled in directions diametrically opposite to each other.
- a cured film 207 having a desired groove/land pattern shape (pattern shape associated with the groove/land shape of the mold 205 ) at a desired position can be obtained by a series of steps (production process) including the step (1) to the step (5).
- the method of producing a film having a pattern shape of this embodiment enables the following: the curable composition (A1) 202 is laid on most of the surface of the substrate 201 in the step (1), and a repeating unit (shot) including the step (2) to the step (5) is repeatedly performed on the same substrate a plurality of times.
- the step (1) to the step (5) may be repeatedly performed on the same substrate a plurality of times.
- a cured film 207 having a plurality of desired groove/land pattern shapes (pattern shapes associated with the groove/land shape of the mold 205 ) at desired positions of the substrate 201 (substrate to be processed) can be obtained.
- the step (1) to the step (5) may be collectively performed on the entire surface of the substrate 201 .
- the substrate 201 (substrate to be processed) or the layer to be processed on the substrate 201 (substrate to be processed) can be processed into a pattern shape by using: the cured film 207 having a pattern shape obtained through the step (1) to the step (5), the film serving as a mask; and a processing method, such as etching.
- pattern transfer may be performed by using a processing method, such as etching.
- a circuit structure based on the pattern shape of the cured film 207 having the pattern shape can be formed on the substrate 201 .
- a circuit board to be utilized in a semiconductor element or the like can be produced.
- an electronic instrument such as a display, a camera, or a medical apparatus, can be formed by connecting the circuit board and, for example, a circuit control mechanism for a circuit board.
- the semiconductor element as used herein include a LSI, a system LSI, a DRAM, a SDRAM, a RDRAM, a D-RDRAM, and a NAND flash.
- An optical component can also be obtained by utilizing the cured film 207 having a pattern shape obtained through the step (1) to the step (5) as an optical member, such as a diffraction grating or a polarizing plate (the case where the film is used as one member of the optical member is included).
- an optical component having at least the substrate 201 and the cured film 207 having a pattern shape on the substrate 201 can be obtained.
- a quartz replica of a quartz imprint mold can be produced by: producing the cured film 207 having a pattern shape through the use of a quartz substrate as the substrate 201 and through the step (1) to the step (5); and performing pattern transfer through the use of a processing method, such as etching.
- Another aspect of the present invention described above is to provide an imprint pretreatment coating material (curable composition (A1)) which forms a liquid film as pretreatment coating on a substrate and promotes spreading of components of liquid droplets consisting of a curable composition (A2) in the plane of the substrate when the liquid droplets are dropped onto the liquid film.
- curable composition (A1) an imprint pretreatment coating material which forms a liquid film as pretreatment coating on a substrate and promotes spreading of components of liquid droplets consisting of a curable composition (A2) in the plane of the substrate when the liquid droplets are dropped onto the liquid film.
- the present invention includes the imprint pretreatment coating material which forms a liquid film as pretreatment coating on a substrate and promotes spreading of components of liquid droplets in the plane of the substrate when the liquid droplets are dropped onto the liquid film, wherein the imprint pretreatment coating material contains at least a component (a1) serving as a polymerizable compound and a component (e1) serving as a compound having a surface tension higher than that of the component (a1).
- the surface tension of the imprint pretreatment coating material be higher than the surface tension of the liquid droplets dropped onto the liquid film.
- the surface tension of a composition of the components of the imprint pretreatment coating material except the solvent be higher than the surface tension of a composition of the components of the imprint resist except the solvent.
- such the imprint pretreatment coating material is provided as a set with the imprint resist.
- such a set fulfills the relation that the surface tension of the composition of the components of the imprint pretreatment coating material except the solvent is higher than the surface tension of the composition of the components of the imprint resist except the solvent is provided for realizing favorable imprint.
- the set fulfills the relation that the difference between surface tension of the composition of the components of the imprint pretreatment coating material except the solvent and the surface tension of the composition of the components of the imprint resist except the solvent is 1 mN/m or more and 25 mN/m or less.
- a further aspect of the present invention is to provide a method of pretreating a substrate for favorable imprint, the method comprising coating the substrate with the imprint pretreatment coating material.
- the present invention further includes a method for forming a pattern on a substrate.
- a resist is dispensed dropwise discretely onto a substrate coated with the imprint pretreatment coating material to thereby promote spreading of components of the resist in the plane of the substrate, whereby the time required for imprint processing can be reduced.
- neopentyl glycol diacrylate serving as the component (a1)
- 33,000 parts by weight of propylene glycol monomethyl ether acetate serving as the component (d1)
- pentaerythritol tetrakis(3-mercaptobutyrate) serving as the component (e1) were blended, and the blend was filtered with a 0.2-micrometer filter made of an ultrahigh-molecular weight polyethylene to prepare a curable composition (A1-1).
- the surface tension of a composition of the components of the curable composition (A1-1) except the component (d1) serving as a solvent at 25° C. was measured with an automatic surface tension meter DY-300 (manufactured by Kyowa Interface Science Co., Ltd.) by a plate method involving using a platinum plate. As a result, the surface tension was 33.7 mN/m.
- the measurement was performed under the conditions of a number of times of the measurement of 5 and a prewet immersion distance of the platinum plate of 0.35 mm. The first measured value was excluded, and the average of the second to fifth measured values was defined as the surface tension.
- the surface tension of the curable composition (A2-1) at 25° C. was measured with an automatic surface tension meter DY-300 (manufactured by Kyowa Interface Science Co., Ltd.) by a plate method involving using a platinum plate. As a result, the surface tension was 29.1 mN/m.
- the measurement was performed under the conditions of a number of times of the measurement of 5 and a prewet immersion distance of the platinum plate of 0.35 mm. The first measured value was excluded, and the average of the second to fifth measured values was defined as the surface tension.
- a film of the curable composition (A1-1) having a thickness of from about 5 nm to about 10 nm can be obtained by applying the curable composition (A1-1) onto a silicon substrate with a spin coater.
- One-picoliter droplets of the curable composition (A2-1) can be arranged discretely on the film of the curable composition (A1-1) by using an inkjet method.
- a droplet amount is set to, for example, such an amount that the average thickness of a cured film becomes about 50 nm.
- the surface tension of the curable composition (A1-1) arranged in the lower layer is higher than the surface tension of the curable composition (A2-1) dispensed dropwise in the upper layer, and hence the Marangoni effect is expressed and the expansion (prespread) of the droplets of the curable composition (A2-1) is quick.
- Curable compositions (A1-2) to (A1-5) and (A1-1′), and curable compositions (A2-1) and (A2-1′) are prepared in the same manner as in Example 1 except that the components as shown in tables 1 and 2 are used.
- the surface tension of a composition of the components of the Curable Composition (A1-2) to (A1-5) and (A1-1′) except the component (d) serving as a solvent, and Curable Compositions (A2-1) and (A2-1′) at 25° C. was measured with an automatic surface tension meter DY-300 (manufactured by Kyowa Interface Science Co., Ltd.) by a plate method involving using a platinum plate in the same manner as in Example 1. The results are shown in Table 3. The measurement was performed under the conditions of a number of times of the measurement of 5 and a prewet immersion distance of the platinum plate of 0.35 mm. The first measured value was excluded, and the average of the second to fifth measured values was defined as the surface tension.
- Example 3 The results of the Examples 2 to 5 are shown in Table 3. Since the surface tension of the curable composition (A1) arranged in the lower layer in the same manner as in Example 1 includes the component (e1) that has a high surface tension, the surface tension of the curable composition (A1) is higher than the surface tension of the curable composition (A2) dispensed dropwise in the upper layer, and hence the Marangoni effect is expressed and the expansion (prespread) of the droplets of the curable composition (A2) is quick.
- the speed of the prespread is slower than those of Examples 1 to 3 because the curable composition (A1) does not contain the component (e1) that is a hydrogen donor and has a high surface tension.
- Results of the examples and the comparative example are shown in Table 3.
- the evaluation of the prespread was a relative evaluation with reference to Example 1. In other words, when the speed of the prespread was as fast as that of Example 1, the speed was evaluated as being “fast”, and when the speed was slower than that of Example 1, the speed was evaluated as being “slow”.
- Curable composition (A1) (A2) Surface Surface Composition tension Composition tension name [mN/m] name [mN/m] Prespread Example 1 (A1-1) 33.7 (A2-1) 29.1 Fast Example 2 (A1-2) 34.9 Fast Example 3 (A1-3) 40.1 Fast Example 4 (A1-4) 38.8 Fast Example 5 (A1-5) 37.7 Fast Comparative (A1-1′) 27.9 (A2-1′) 29.1 Slow Example 1
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US15/453,557 US10829644B2 (en) | 2016-03-31 | 2017-03-08 | Pattern forming method as well as production methods for processed substrate, optical component, circuit board, electronic component and imprint mold |
JP2018508023A JP7086841B2 (ja) | 2016-03-31 | 2017-03-28 | パターン形成方法、加工基板の製造方法、光学部品の製造方法、回路基板の製造方法、電子部品の製造方法、インプリントモールドの製造方法 |
KR1020187030447A KR102208977B1 (ko) | 2016-03-31 | 2017-03-28 | 패턴 형성 방법과, 가공 기판, 광학 부품, 회로 기판, 전자 부품 및 임프린트 몰드의 제조 방법 |
PCT/JP2017/012507 WO2017170466A1 (ja) | 2016-03-31 | 2017-03-28 | パターン形成方法、加工基板の製造方法、光学部品の製造方法、回路基板の製造方法、電子部品の製造方法、インプリントモールドの製造方法 |
TW106111213A TWI632046B (zh) | 2016-03-31 | 2017-03-31 | 圖型形成方法、加工基板之製造方法、光學元件之製造方法、電路基板之製造方法、電子元件之製造方法、轉印模具之製造方法 |
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KR20180127433A (ko) | 2018-11-28 |
US20170283620A1 (en) | 2017-10-05 |
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KR102208977B1 (ko) | 2021-01-28 |
TWI632046B (zh) | 2018-08-11 |
TW201736086A (zh) | 2017-10-16 |
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